Constraining Ion-Scale Heating and Spectral Energy Transfer in Observations of Plasma Turbulence

Author
Keywords
Abstract
<p>We perform a statistical study of the turbulent power spectrum at inertial and kinetic scales observed during the first perihelion encounter of the Parker Solar Probe. We find that often there is an extremely steep scaling range of the power spectrum just above the ion-kinetic scales, similar to prior observations at 1 A.U., with a power-law index of around -4 . Based on our measurements, we demonstrate that either a significant (\&gt;50 \%) fraction of the total turbulent energy flux is dissipated in this range of scales, or the characteristic nonlinear interaction time of the turbulence decreases dramatically from the expectation based solely on the dispersive nature of nonlinearly interacting kinetic Alfv\ en waves.</p>
Year of Publication
2020
Journal
Physical Review Letters
Volume
125
Number
Number of Pages
025102
Date Published
07/2020
ISSN Number
0031-9007
URL
https://link.aps.org/doi/10.1103/PhysRevLett.125.025102
DOI
10.1103/PhysRevLett.125.025102